Mounting for removable screens of hammer mills, grinders, and the like



Aprll 29, 1947. w. P.'GRUENDLER 2,419,773

MOUNTING FOR REMOVABLE SCREENS OF HAMMER MILLS, GRINDERS, AND THE LIKE Filed Oct. 11, 1943 2 Sheets-Sheet l M l/EN roe.-

hu. L IA M P. Gel/album:

2 Sheet-Sheet 2 P. GRUENDLER MOUNTING FOR REMOVABLE SCREENS Ob HAMMER Filed 001;. 11, 1943 MILLS, GRINDERS, AND THE LIKE April 29, 1947.

Errata/:34

Patented Apr. 29, 1947 NITED STATES PATENT, orsics MOUNTING FOR REMOVABLE SCREENS F HAMMER MILLS, GRINDERS, AND mi:

LIKE

William P.'Gruendler, CIaytonLMoQ-Qassignor to Gruendler Crusher & Pulverizer Company, St. Louis,"Mol;" a-corporation of Missouri Application October 11, 1'943',"'seria11v;505573 invention, relates I generally crusher S.

breakers, grinders, and other. reducing machines and, more particularly, to a certain new and usef ul improvement in a mounting for. a removable screen of a hammer mill, grinder or the like.

Myinvention has, for its chief objects the'pro- ,Vision of a grinding machine for the purposes stated which is, uniquely capable of accommodating. .the. dispositicnfor hammer cooper'ation of interchangeable screens or breaker-plates of different mesnfor reducing the feed to a selected degree of fineness.

My-invention has for a further object the provision of a mounting for -a removablqe screen of a hammer'mill, grinder, or the ,-like;which may be readily-constructed, which is sturdy and durable, which is economic inoperation and maintenance, and whichis efiicient in-the-performance of its intended functions,

- My; invention has for another cbject the pre- ;vision ofa mounting ior-aremovable screen of "the type statedwhichmakespossible the-speedy and quick removal of a screen and yetwillhold the screen securely and firmly inoperative position and prevent-- undue leakage of' chaff "and 'dust; into the atmosphere external to the grinder or mill housing.

And with the above and other objects in view,

, my invention'resides in the novel features of form,

construction, arrangement,- and combination'of parts-presently described and pointed out '"in the claims. I

In the accompanying drawings (three sheets) Figure 1 is a'rear' end elevational view of the grinder;

Figure 2 is-a vertical sectionalview of the'machine taken approximately along the line 2--2, Figure 1;

,Figur 3 is an enlarged fragmental sectional view of the meeting ends'of the breaker'plate and a coperable screen and'the attached lower end of the screen clamping-irimeyi 7 Figure 4*is an-enlarged'detail' sectional'view able cover-plate" of themachlne;

Figure 7 isan enlargedfbrokenelevational view of the oscillatoryscreen-clamp n frame?" Figure 8 is a'detail sectional view taken anproximately on the line 8- F g Z Figufegi s an enlarged 'detalifview showing in 3 claims. (011241-89) 2 side'elevation theratchet and quadrant mechi mj' Referring now more in detailand by reference characters to theaccompanying drawings, which illustratea preferred embodiment of my inventicn, the grinder includestan approximately rectangular frame or housing A comprising suitable side walls I, I, a front wall 2, and a rear wall .3, all having preferably the form or contour shown,

10 all'suitably flanged'and bolted or otherwiseflxed rigidly together and to supporting base-forming I bears 4, 4, and all preferably equipped with reenforcing webs or the like 5.

v Along their upper margin' the side walls I", I, are partly of arcuate formation as at a, and partly straight, as at a. Along their straight portion a, the sidewalls .l; I, are provided or formed with opposed outwardly presented flanges 6, each formed, for purposes presently appearing, with 20, a threaded opening or seat, as at 6', and; as best seen in Figure; and for purposes also presently appearing, the oppositeside walls I, I, are suitably provided or formed at'a proper location within their area with oppositely disposed elongated arcuat'e recesses or pockets I, which, throughout their length, open to the respective inner faces of said walls I, I, and adjacent their upper end are preferably en1arged,as 'at I, Fixed to and upon-and projecting inwardly from the respec- 'tive inner faces of, said walls I, I, at the base of :the recesses I',are rigid blocks 8.

. fI'hefiframe front wall 2 is reduced in height relatively to the frame side and rear walls 1,3, as best seen in Figure 2, and extending between,

and having a bearing for rotation in the frame side walls Iin suitably spaced adjacence to the frame front wall 2, as alsobest seen in Figure 2, is-the supporting shaft 9 of the rotor B, which includes; a suitable plurality of disks I0 fixed in 40 suitably spaced relation on shaft 9 and hammerbars- II pivotally attached at their respective inner ends, as at It, to and between and adjacent {the respectiveperipheries of thedisks ID, as will pe wen understood, the present grinder, so I far as "its'rotor B is' 'concernedpbeing' of well-known hammer type.

'iyuitably andpreferably'detachably secured to i and upon the upper-margin of the arcuate por-"s nan dot the frame sidewalls I and concentrically 5 0 disppsedover'the rotor B, asfurth er best seen in "Figure 2-, is 'an arcuate'='cover-plate= or frame; top "wall I3, fixed to'and uporrthe inner iace of which is a plate I4 of corresponding curvature "formed with multiplicity cf; preferably'circular aperteena er openings, as at 15, the inwardly presented margins of which provide or form cutting edges for co-operation with the hammers H in feed reduction in the operation of the machine, as presently more fully appears, the wall 13 and its attached cutter or reducing plate I 4 being spaced at their front margin from the top margin of the front wall 2 and thereby providing a mouth, as at C, into the cage D of the rotor B partly formed by the cover-plate l3.

Suitably bolted or otherwise fixed at their inner margin to the frame side walls I and cover-plate l3 and presented forwardly from, and forming substantially extensions or continuations of, the walls I, are side plates l6, l6, of angular outline or contour in side elevation, and bolted or otherwise suitably joined to, and extending between,

the side plates l3 at and along their lower beveled.

its one or downwardly presented leg or flange .fl'atwise abutting and bolted or otherwise attached, as at 29, to the opposed blocks 8 and forming substantially a part of a screen clamping-frame H, is an angle-bar 30 having its other leg presented rearwardly and so disposed relatively to the bar G as to provide a seat or support,

as at 3|, for the lower'end of a removable and interchangeable screen J of suitable curvature for completing the cage D of the rotor B approximately concentrically about the rotor shaft 9.

Welded or otherwise permanently fixed at their lower end, as at 32, to the angle 30 and forming part of the rockable frame H, is a pair of spring steel straps or bands 33 approximately thick by l"-1 f wide, depending upon the size of the particular machine, which are movably or shiftably disposed within the respective pockets orrecesses 7, as best seen in Figures 2, 4, and 5.

Preferably, as indicated best in Figure '7, the flat straps or bands 33 are for length adjustment of two-part structure and at their respective upper end are looped, as at 34, about pins or studs 35 fixed to, and projecting inwardly of the frame A from, cam-members 35 accommodated by the pocket-enlargements l and fixed, in turn, to and upon a shift 31 journaled in opposed bearings 38 on, and extending crosswise of the machine between, the frame side walls I, I.

At one end, the shaft 31 is extended, as at 31', and fixed thereon is the hub 39 of a bell-crank lever 49 having one arm equipped with a springpressed pin or dog 4| for yielding releasable engagement with an arcuate ratchet or quadrant 42 fixed in co-operable location on the adjacent frame side wall I'.

Each particular screen J, it may be here said, is provided preferably throughout its area with apertures r perforations 43 of selected mesh and is of such relative dimensions as to project at its upper margin, when supported at its lower margin on the seat 3|, slightly above the plane of the marginal portions a of the frame side walls I as indicated in Figure 2, for convenient manual gripping or grasping engagement at a handle 44 provided for the purpose upon its upper margin, as best seen in Figure 4.

It will be evident that, as the lever 40 is swung in one direction, the shaft 31 will be correspondingly rotarily actuated, whereupon the straps 33 and. cams 36 will be shifted or rocked into supporting and engaging relation to and with the particular installed or seated screens J and the latter thereby rigidly held in cage-completing rev lation about the rotor B, and that, when the lever 3,40" is reversely. swung, zthe 'ca'm's 36 ;and straps 33 will be'rocked or shifted out of engagement with the installed screen J, whereupon the screen J may, by means of its handle 44, be very easily and conveniently removed for the like installation of a second screen J of likewise selected mesh for delivering from the machine feed or other material ground or reduced to the desired degree of fineness.

7 Fixed to and upon the inner face of the respective frame side walls I, are suitable supports for a bottom pan 46, which in transverse section has preferably the form or contour, as best seen in Figure 2, to abut at its forward margin the blocks 8 and to rest at its rear margin on a web 41 provided for the purpose on the frame rear wall 3.

In use and operation, as has been indicated,

the feed or other material to be reduced or ground,

amounts controlled by the operator by means of the adjustably shiftable door 23, into the chute E, through the mouth C and into the cage D, where the feed or other material is further reduced, as will be Well understood, by and between co-operative grinding action of the hammers II and the bar G and apertured plate 14, the ground feed then passing or flowing through the installed screen J upon the pan 46.

The degree of fineness of the discharging feed is governed by the particular installed screen J. Each machine includes a plurality of such screens, and such screens interchangeably differ one from the other only in the size or mesh of its perforations or apertures 43. Actuation of the lever 40 releases the installed screen J for convenient manual removal, whereupon a substitute screen J may be readily installed and clamped, on reverse actuation of the lever 40, in installed position.

It may be added that the seatsB of the side wall flanges 6 support upstanding threaded shanks 54, and slidably disposed on such flanges 6, is a supplemental cover-plate having slots 56 for shiftably accommodating the shanks 54. Tlneaded on the shanks 54, are nuts or the like 51 for engaging the cover-section 55 for removably securing the same either in closure position over the frame A and in abutting relation at its forward margin with the installed screen J, as

indicated in Figure 2, or in rearwardly shifted position, as indicated in Figure 5, for permitting convenient removal and installation of respective screens J.

The mounting of the present invention 'has been found to be exceedingly efficient in the performance of its functions and in accomplishing the objects stated, and it is to be understood that changes and modifications in the form, construction, arran ement, and combination of the several parts of the mounting may be made and substituted for those herein shown and described without departing from the nature and principle of my'invention.

Having thus described my invention, what ,I

claim and desire to secure by Letters Patent is:

1. A grinding machine comprising, in combination; a housing including side walls having opposed arcuate recesses, a rotor-cage, a support within the housing, the cage including a removable screen normally seated at its lower margin upon said support, and means for removably securing the screen in cage completing relation about the rotor, said means including a pair of yielding bands fixed at an end to said support and disposed for movement in said wall recesses, a shaft mounted for rotatory movement on the housing adjacent the upper margin of said side walls, cam-members fixed on said shaft for movement in said recesses, opposed studs projecting inwardly from said cam-members, said bands having a loop connection at their free end with said studs, and lever-ratchet mechanism mounted on the housing rotarily actuating the shaft and its attached cam-members for shiftin the bands into engaging relation with the screen.

2. A grinding machine comprising, in combination, a housing including side walls having opposed arcuate recesses and a top wall having a transversely extending opening, a rotor-cage, a support within the housing, the cage including a removable screen normally seated at its lower margin upon said support and being provided at its upper margin with an upwardly projecting portion extending outwardly through the opening in the top wall, and means for removably securing the screen in cage completing relation about the rotor, said means including a pair of yielding bands fixed at an end to said support and disposed for movement in said wall recesses, a shaft mounted for rotatory movement on the housing adjacent the upper margin of said side walls, cam-members fixed on said shaft for movement in said recesses, opposed studs projecting inwardly from said cam-members, said bands having a loop connection at their free end with said studs, lever-ratchet mechanism mounted on the housing rotarily actuating the shaft and its attached cam-members for shifting the bands into engaging relation with the screen, and closure means operatively mounted on the housing for optional movement into and out of closure-forming position over the opening in said top wall and when closed being positioned for engagement with the upwardly projecting portion of the screen and forcing the latter into engagement with the housing.

3. A grinding machine comprising, in combination, a housing including side walls having opposed arcuate recesses and a top wall having a transversely extending opening, a rotor-cage, a support within the housing, the cage including a removable screen normally seated at its lower margin upon said support and being provided at its upper margin with an upwardly projecting portion extending outwardly through the opening in the top wall, and means for removably securing the screen in cage completing relation about the rotor, said means including a pair of yielding bands fixed at an end to said support and disposed for movement in said wall recesses,

6 a shaft mounted for rotatory movement on the housing adjacent the upper margin of said side walls, cam-members fixed on said shaft for movement in said recesses, opposed studs projecting inwardly from said cam-members, said bands having a loop connection at their free end with said studs, leveraratchet mechanism mounted on the housing rotarily actuating the shaft and its attached cam-members for shifting the bands into engaging relation with the screen, a slidingclosure plate operatively mounted on the housing for optional movement into and out of closureforming position over the opening in said top wall and when closed being positioned for engagement with the upwardly projecting portion of the screen and forcing the latter into engagement with the housing, upstanding threaded members mounted adjacent to the closure plate, and nuts mounted on the threaded members for optional engagement with the closure plate whereby to hold said plate in closed position.

WILLIAM P. GRUENDLER.

REFERENCES CITED The following references are of record in the file of this patent:

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